UNFINISHED: The death at Itaquerao Stadium is the eighth to occur at the Brazil 2014 sites [GETTY]

The row has thrown tournament plans into chaos with the event due to start in Brazil on June 12.

Builders at the Itaquerao Arena in São Paulo downed tools in protest at another death of a construction worker.

Organisers now fear the ground will not be completed in time for the curtain-raiser between the hosts and Croatia.

“The stadium was originally due to be handed over last year. It is extremely worrying that deadlines keep being missed”

Anonymous source

A source said: “The stadium was originally due to be handed over last year. It is extremely worrying that deadlines keep being missed.”

Worker Fabio Hamilton da Cruz, 23, plunged 26ft to his death while installing seating, making him the eighth labourer to die at Brazil 2014 sites. Three deaths have been in São Paulo. Building firm Fast Engenharia, in charge of seating at the Itaquerao, have now vowed to put extra safety measures in place.

The 65,000-seater stadium was already behind schedule after two workers were killed when a crane collapsed.

It is one of six grounds that was not finished by Fifa’s 2013 deadline. Two others remain under construction, one in Cuiaba and the other in Curitiba.